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[Bug 1457554] Re: host-evacuate-live doesn't limit number of servers evacuated simultaneously from a host

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Pawel Koniszewski <pawel.koniszewski@xxxxxxxxx>
Date: Mon, 01 Jun 2015 08:35:24 -0000
Reply-to: Bug 1457554 <1457554@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

Nova allows to live migrate multiple VMs at a time, there's no limit for
simultaneous live migrations - everything depends on use case and setup
configuration (particularly network configuration and bandwidth).

host-evacuate-live is implemented in python-novaclient, so nothing to
fix in nova.

** Changed in: nova
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1457554

Title:
  host-evacuate-live doesn't limit number of servers evacuated
  simultaneously from a host

Status in OpenStack Compute (Nova):
  Invalid

Bug description:
  Attempting to evacuate too many servers from a single host
  simultaneously could result in bandwidth starvation. Instances dirty
  their memory faster than they can be migrated, resulting in instances
  perpetually stuck in the migrating state.

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